magnetism		change in an object's position
sound		a force that opposes, or acts against, motion when two surfaces rub against each other
solution		a type of mixture in which the ingredients are thoroughly mixed together
wave		a state of matter in which the molecules are very far apart
motion		a form of energy in which vibrations can be heard
energy		a state of matter in which the molecules are tightly packed together
magnet		the state of matter that has a definite volume and takes the shape of the container it is placed in
lens		the force between poles of magnets
gas		a change that occurs in a substance that cannot be reversed
circuit		the back-and -forth movement of an object that produces sound
Insulator		a push or a pull on an object
refraction		material that allows energy to travel through it easily
mass		a resource that cannot be used up (wind, sun, water)
Inexhaustible resource		the way in which light and sound energy travel
solid		a closed path through which electicity travels
chemical change		the tendency of a moving object to keep moving or a still object to remain at rest
vibration		a collection of materials in which the materials do not join together
inertia		a tool used to determine if an object has magnetism
weight		anything that has mass and takes up space
friction		an object used to refract light
force		the measure of the pull of gravity on an object
reflection		the units that make up matter in its solid, liquid, or gas forms
matter		the amount of matter in an object
mixture		the ability to do work; the ability to cause change and make things happen
molecule		the bending of light as it passes through objects
conductor		the bouncing of light from a surface, mirror
liquid		material that prevents energy from traveling through it